import java.util.Arrays;
import java.util.Comparator;

class Student implements Comparable<Student> {
    public String name;
    public int age;
    public int score;

    public Student(String name, int age, int score) {
        this.name = name;
        this.age = age;
        this.score = score;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", score=" + score +
                '}';
    }

    @Override
    public int compareTo(Student o) {
//        if (this.age > o.age) {
//            return 1;
//        } else if (this.age < o.age) {
//            return -1;
//        } else {
//            return 0;
//        }
        return this.age-o.age;
    }
}
class AgeComparator implements Comparator<Student>
{
    @Override
    public int compare(Student o1, Student o2) {
        return o1.age-o2.age;
    }
}
class  ScoreComparator implements Comparator<Student>
{
   @Override
   public int compare(Student o1, Student o2) {
        return o1.score-o2.score;
        }
}
class NameComparator implements Comparator<Student>
{
    @Override
    public int compare(Student o1, Student o2) {
        return o1.name.compareTo(o2.name);
    }
}
public class Test1 {
    public static void main(String[] args) {
        Student[] students=new Student[3];
        students[0]=new Student("zhang",8,90);
        students[1]=new Student("lisi",10,95);
        students[2]=new Student("abc",15,98);

        AgeComparator ageComparator=new AgeComparator();
        ScoreComparator scoreComparator=new ScoreComparator();
        NameComparator nameComparator=new NameComparator();

        //Arrays.sort(students,ageComparator);
        //Arrays.sort(students,scoreComparator);
        Arrays.sort(students,nameComparator);
        System.out.println(Arrays.toString(students));
    }
    public static void main1(String[] args) {
        Student[] students=new Student[3];
        students[0]=new Student("zhang",8,90);
        students[1]=new Student("lisi",10,95);
        students[2]=new Student("abc",15,98);
        Arrays.sort(students);
        System.out.println(Arrays.toString(students));
    }
}
